Add/Change PHP.MigrationSet to update array/list syntax to short one

[keradus]

No description provided.

[tigitz]

I understand "Migration" as a replacement of a deprecated concept by a new one.

Short array syntax is just an alternative way to express your arrays. array() is not deprecated and short array syntax is not meant to replace it.

Just because someone prefers array() syntax doesn't mean they haven't migrated to 5.4

I feel the rule should stay out of a migration set and be kept as a style preference.

[keradus]

When I created Migration rulesets, they were for purpose of "let use the new language/syntax/feature of higher version of PHP/PHPUnit". I agree one can say it's a matter of style. But one can also say that not using ** operator is matter of style, and we aim to use it, if possible. But no worry, one can always disable the rules s/he would not like to follow

[keradus]

Closes #5389

[glensc]

PHP54Migration but then you say PHP 5.6, seems weird.

[keradus]

typo, already fixed in other PR. thanks